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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f58fe9ce42526afdb4a58c016e86e65aa32f5ed36b2ede37e8ba54bba3c84998' 
  AND token = 'vV0/Bie48kNaCod+tLMzbjWVFIf0H/2KR/qolHhSVnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}